Setting Up for YoUr Advent Ure
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Setting Up for Your Adventure
Before you can start making cool Python programs for your Minecraft world, you need to set up Minecraft, Python, and a few other things on your computer. In this chapter, I'll show you how to install and run all the required software. Installing the software and setting up your
computer is the hardest part of this book, so grab an adult or technical friend if you need help. Take it slow and follow each step closely or things might not work as expected.
You have a few options, depending on what kind of computer you have. You can use Minecraft on your Windows PC or Mac, or you can use Minecraft: Pi Edition on a Raspberry Pi computer. If you're using a Windows PC, just keep reading. If you're using a Mac, flip to "Setting Up Your Mac" on page 13. If you're using a Raspberry Pi, flip to "Setting Up Your Raspberry Pi" on page 22.
If you have any issues during setup, see the appendix on page 289 for troubleshooting help.
N o t e For more information and updates to these instructions, visit the book's website at .
Setting Up Your Windows PC
You need to install five things so you can control Minecraft with Python:
? Minecraft ? Python 3 ? Java ? Minecraft Python API ? Spigot Minecraft Server
In this section, I'll guide you through installing each of these on your computer. Let's start with Minecraft.
Installing Minecraft
If you already own Minecraft and have the latest version installed on your PC, skip ahead to "Installing Python" on page 3. If you're not sure whether you have the latest version of Minecraft, follow the steps in this section to install the latest version.
If you don't already own the game, you can buy a copy from the official Minecraft website, . You might need to grab a grown-up to help you with that! Remember the username and password you use when you purchase Minecraft--you'll need it to log in later.
After you've purchased Minecraft, follow these steps to install Minecraft on your PC:
1. Go to . 2. Under the Minecraft for Windows section, find and click the green
DOWNLOAD button to download the Minecraft installer. If you're given the option to save or open the file, select Save File. 3. Wait for the file to download and then open it. If a dialog pops up asking whether you want to run this file, click Run. Don't worry, we know this file is safe! 4. When the Minecraft Setup Wizard opens, click Next. Then click Next once more. Then click Install. 5. You might be asked whether you want to install Minecraft. Of course you do! Click Yes. Wait a bit while Minecraft installs. I got a glass of water and a cookie while the game installed. 6. After the installation completes, click Finish.
Minecraft should now be installed.
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You know what would be a great idea? Playing Minecraft, of course. Take a few minutes to get it up and running:
1. To open Minecraft, click the Start Menu (or press the Windows key on your keyboard), find Minecraft in the list of programs, and click the icon.
2. Minecraft will start up and might install updates. 3. The login window will open next. Enter the username and password
you used when you purchased Minecraft and click Log In. 4. Click Play. Minecraft will download a couple more updates before
opening. 5. Finally, click Single Player4 Create New World. Name your world what-
ever you want and click Create New World. The world will generate, and you can play to your heart's content.
Have some fun! If you've never played Minecraft before, try playing around for a while, until it gets dark in your Minecraft world. Watch out for monsters! Note that when you use Minecraft with Python, you'll be using a multiplayer game world, which will be different from this world. We'll get to that in "Running Spigot and Creating a Game Profile" on page 7.
Back to work! It's time to install Python. To free your cursor from Minecraft, just press esc on your keyboard. Close Minecraft before continuing the rest of the installation.
Installing Python
Python is the programming language you'll learn in this book. Let's install it now.
1. Go to . 2. Click the button labeled Download Python 3.6.2. (This is the latest
version of Python 3 at the time of this writing, but you might see a later version. Install the most recent version.) 3. Python will begin to download. If you're asked to choose between saving or opening the file, select Save File. 4. When the installer has downloaded, click it. If a dialog pops up asking whether you want to run the file, click Run. 5. When the installer opens, select the Add Python 3.6 to PATH checkbox, as shown at the bottom of Figure 1-1. Then click Install Now.
Setting Up for Your Adventure 3
Figure 1-1: Make sure you select Add Python 3.6 to PATH.
6. A dialog might ask whether you want to allow the program to install software on the computer. Click Yes and then wait for Python to install. I stood up to close the window while it was installing, and the installation had finished when I sat back down.
7. Click Close. Python is now installed.
Installing Java
Now that Minecraft and Python are both installed, you'll have to set things up so that they can talk to each other. You'll use a program called Spigot to do that, but in order for Spigot to work, you first need to make sure Java is installed on your computer. Let's do that now.
First, check whether Java is already installed:
1. Click the Start Menu (or press the Windows key on your keyboard) and enter cmd in the search box. Open the program called cmd.
2. You'll see a window with a black background and a prompt (mine says C:\Users\Craig>). At the prompt, type java -version and press enter.
3. If you see a message like the one in Figure 1-2 and the Java version (that's the number after the first period) is 8 or newer, the correct Java version is already installed. Skip ahead to "Installing the Minecraft Python API and Spigot" on page 6.
4. If you get a message that says that Java is not recognized or the version is older than 8, install it using the following instructions.
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Figure 1-2: After entering the java -version command, I can see that Java is installed.
To install Java, follow these steps:
1. Go to . 2. Click the Free Java Download button. Then click the Agree and Start
Free Download button. 3. When the installer has downloaded, click it. If a dialog pops up asking
whether you want to let the program make changes to your computer, choose Yes. 4. When the installer opens, click Install. 5. This bit is super important! If a page opens that asks if you want to install another program, such as the Ask Search App, a Yahoo! search bar, or something else, uncheck the box so that this extra program will not install. That's just another program that you don't need. 6. You might be asked if you want to set Yahoo! as your homepage. You probably don't. Select Do not update browser settings and click Next. 7. Wait while Java installs. I wrote a short message to a friend before it installed. Click Close when it finishes.
Now let's check whether Java has installed properly:
1. Click the Start Menu and enter cmd in the search box. Open the cmd program.
2. In the cmd window, type java -version at the prompt and press enter. 3. If you see a message like the one in Figure 1-2, Java installed correctly. If
you get an error that says "`Java' is not recognized as an internal or external command, operable program or batch file," Java hasn't installed properly. To fix this, try reinstalling Java and running it again. If you still get this error after reinstalling, go to download/help/path.xml for more information.
That's it! Java is set up and ready to run the Minecraft server! Let's get to that next.
Setting Up for Your Adventure 5
Installing the Minecraft Python API and Spigot
Next you need to install the Minecraft Python API and the Minecraft server on your computer.
API stands for application programming interface. It lets programs communicate with applications that other people have created. In this case, the Minecraft Python API allows programs that you write in Python to communicate with Minecraft. For example, you could write a Python program that uses the API to tell Minecraft to make a block in the game or to change the position of the player.
A standard Minecraft single-player game doesn't support an API. Instead, your programs will interact with a Minecraft server, which allows the use of APIs. Minecraft servers are mostly used online so that many people can play together in a single game world. But you can also run a server on your own computer and play by yourself. Both multiplayer and single-player Minecraft servers allow you to use an API with Minecraft. In this book, you'll be using a single-player Minecraft server called Spigot on your computer.
Now that you know what an API and a server do, let's get them installed on your computer. I've created a handy download so you can get these set up quickly. Just follow these steps:
1. Go to and click the "download the setup files for Windows (Minecraft Tools.zip)" link. This will take you to a download page at SourceForge. Click the green Download button. If you're given the option to save or open the file, select Save File.
2. When the file has downloaded, right-click it and choose the Extract... option. You'll be asked where you want to put the extracted files. Click the Browse button and go to your Documents folder. Then click the New Folder button and call the new folder Minecraft Python. Select this folder and click OK. If prompted to, click Extract to extract the files.
3. Go to the Minecraft Python folder in your Documents folder, where you should see the extracted files.
4. Open the Minecraft Tools folder. Its contents are shown in Figure 1-3.
5. Double-click the file called Install_API. This will open a new window and install the Minecraft Python API. If you get a warning message, click Run Anyway.
6. When the installation completes, press any key to finish.
Note
If you get an error message that says pip is not recognized, that means you didn't install Python correctly. Go back to "Installing Python" on page 3 and reinstall Python. Make sure you select the checkbox that says Add Python 3.6 to PATH.
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Figure 1-3: The Minecraft Tools folder
The Minecraft Python API and Minecraft server are now installed. The final step is to run the server. We'll do that in the next section.
Running Spigot and Creating a Game Profile
When Spigot runs for the first time, it'll create a Minecraft world for you, but you need to do some setup before you can use it for the first time. You'll need to set up a profile to make sure Spigot and Minecraft are always running the same version.
To start Spigot, follow these steps:
1. Go to your Minecraft Python folder and open your Minecraft Tools folder. 2. In the Minecraft Tools folder, double-click the Start_Server file. If you get
a message asking whether you want to allow access, click Allow. 3. A window will appear and begin to set up the server. Once the setup
is finished, scroll to the top of the text in the window. Near the top (around the third or fourth line), you should see text saying Starting minecraft server version x.x.x. For example, in Figure 1-4, the server version is 1.11.2. 4. Make a note of the version number shown on your screen, and keep this window open.
Setting Up for Your Adventure 7
Figure 1-4: The version of this server is 1.11.2.
Choosing the Right Minecraft Version Now that you know which server version you're using, you can set up the game profile:
1. Open the Minecraft launcher, but don't click the green PLAY button quite yet (make sure you leave the server window open when you do this).
2. At the top-right of the Minecraft launcher, click the menu button (which looks like three parallel lines), then click the Launch Options button. This will allow you to access the profile editor.
3. Click the Add New button to create a new configuration. 4. In the Name field, type Learn to Program with Minecraft. 5. In the Version drop-down menu, select the version of the server that
you're using. For example, in Figure 1-5, I'm using version 1.11.2. 6. Click the Save button. Your profile has now been set up. Click the cen-
tral Minecraft logo to return to the screen with the green PLAY button.
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Figure 1-5: I've created a profile called Learn to Program with Minecraft that uses version 1.11.2.
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